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Metrel MI 3102 BT - Eurotest XE Manual

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MI3002 MI3100 MI3102 IT supply systems
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Step 5 Use the À key to select second live line (e.g. L2). Use the ½/¾ keys to
decrease indicative insulation resistance until insulation monitor device
alarms bad insulation. Indicative insulation resistance and calculated first fault
current between second live conductor (e.g. L2) and PE conductor are
displayed.
To complete measurement press the TEST key again.
After performing the measurement results with PASS/FAIL indication appear
on the display.
Figure B.8: First fault condition between L2 and PE
Displayed results:
R1...........Threshold indicative insulation resistance for L1,
I1 ............Calculated first fault leakage current at treshold insulation
resistance for L1,
R2...........Threshold indicative insulation resistance for L2,
I2 ............Calculated first fault leakage current at treshold indicative insulation
resistance for L2.
First fault leakage currents I1 and I2 are calculated as follows:
1
21
1R
U
ILL −
=,
2
21
2R
U
ILL −
=
where:
UL1-L2 .......Measured voltage between L1 and L2,
R1............Threshold insulation resistance for L1,
R2............Threshold insulation resistance for L2.
The calculated first fault current is the maximum current that would flow when
insulation resistance decreases to the same value as the applied test
resistance, and a first fault is assumed between opposite line and PE.
Save displayed results for documentation purposes. Refer to chapter 6.1.
Saving results.
Note:
It is recommended to disconnect all appliances from the tested supply net to
receive regular test results. Any connected appliance will influence the insulation
resistance threshold test.
The displayed resistances and currents are indicative only. Displayed resistance
can significantly differ from the actual resistance the Eurotest simulates. If IMD’s
with very low test currents (below 1mA) are checked the displayed resistance
value is typically lower (and current higher) than the actual simulated resistance.
The difference is lower for lower set resistances.
… 95 …


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